The fleet made several expeditions _______ the exploration was stopped.
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A
when
B
before
C
while
D
since
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(2013·吉林长春三校高三调研)It is important to introduce children to healthy nutritious foods from ________ they begin to eat solids.
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A
what
B
when
C
that
D
which
Gun control is a subject _________ Americans have argued for a long time..
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of which
B
with which
C
about which
D
into which
You must observe and gather information like Nicolaus Copernicus ________ you want more career advancement opportunities.
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A
or
B
because
C
unless
D
if
Our parents always tell us to believe in_______we do if we want to succeed.
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A
why
B
how
C
what
D
which
Everyone is different and that is ________ makes our world so much better.
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A
that
B
which
C
what
D
who